That's understandable. Being in an abusive relationship is traumatic, and when something reminds you of what you were dealing with, it's going to trigger those feelings associated with your evil ex. The only thing you can do is to ask yourself questions about what you're feeling and why, and not scold yourself for sometimes having anxiety because of your past relationship (in other words, try to not feel bad for feeling bad.)

If you don't feel comfortable talking to your current boyfriend, a trusted friend could help you work through these feelings. If you can afford therapy, it would probably help you more than you might think. Check your health insurance plan if you have one to see if therapy is covered; sometimes the first couple of visits are. If you are still a student, you should go to the student counseling center without delay. It's an amazing resource, and it exists for just this kind of situation.

Also, here, have an internet hug. Things will get better with time. For what it's worth, every time I've ever seen a relationship like the one you described with your ex, the kinds of hurtful things he said to you generally indicate that the abuser is the broken person, not the abused.